AP Diving or Ambient Pressure Diving, formerly known as A.P.Valves, is a British manufacturer of diving equipment at Water-Ma-Trout in Helston, Cornwall, England. They produce a range of scuba and surface-supplied diving equipment including buoyancy compensator jackets and the Inspiration range of electronically controlled closed circuit diving rebreathers.[1][2][3]
The firm started in 1969 making a valve to allow a diver to breathe from a stabiliser jacket buoyancy compensator's inflation cylinder.[citation needed] They progressed to making divers' adjustable buoyancy life-jackets and stabiliser jackets, and then other diving equipment such as rebreathers.[4] and diving accessories etc.[citation needed]
They often exhibit at diving trade shows.[5]